Add language to local query history items

[starcke]

This adds language to local query history items, similar to what variant analysis items have (see #2894 for implementation draft on top of this). Note that old history items wont have this field so we have to handle undefined language.
I havent touched the DTOs and mappers before so I was not sure whether I need to do more to make it work.

Few notes:

1. I added it to DatabaseInfo based on @shati-patel's suggestion. But I think we are open to other places as well.
2. I moved things related to QueryLanguage from the variant analysis mappers and DTOs to the general mappers and DTOs.
3. I added the option to show the language in the history item as that was nice for testing and it possibly seems useful. I am happy to remove that again.

To test I ran VSCode with a custom format:

"codeQL.queryHistory.format": "%q on %d (%l) - %s %r [%t]",`

and ran an extra local query:

Checklist

• CHANGELOG.md has been updated to incorporate all user visible changes made by this pull request.
• Issues have been created for any UI or other user-facing changes made by this pull request.
• [Maintainers only] If this pull request makes user-facing changes that require documentation changes, open a corresponding docs pull request in the github/codeql repo and add the ready-for-doc-review label there.

[starcke]

is codeQL.queryHistory.format actually user-facing, and if it is then I should probably add a CHANGELOG entry?

[adityasharad]

Change note would be great! We didn't mention it in the changelog when this feature was first introduced, but there is at least one changelog entry for a subsequent improvement to the format.

[starcke]

Added changelog entry